SIRIUS BLACK
1. He doesn't run, he BOUNDS.
2. He was interested in the lives, methods, and music of muggles.
3. He bites his lip when he thinks about his family.
4. He loves his brother, deep down, he really does.
5. He's not a big fan of chocolate (Remus claims that Sirius has no taste buds).
6. He sings in the shower.
7. When he walks, he slouches down a bit and adjusts his posture. He was trained when he was younger to walk with "the name of a Black" on his shoulders. He tries to break this habit that was instilled in him every day.
8. He sometimes tends to act rashly when he's mad or excited.
9. The marauders are his family. They're his brothers.
10. He would die for any one of them.